Tap here to read more about Front Caster Wheel for Toro 74386 74389 74391 74399 ZS4200 Z5000 Z5020. Premium Quality Replacement Part. Front Caster Wheel Assembly. 74386 (ZS 4200) – Toro 42 TimeCutter Zero-Turn Mower (SN: 311000001 – 311999999) (2011). 74386 (ZS 4200) – Toro 42 TimeCutter Zero-Turn Mower (SN: 312000001 – 312999999) (2012). 74389 (ZS 4200 S) – Toro 42 TimeCutter Zero-Turn Mower (SN: 312000001 – 312999999) (2012). 74391 (Z 5000) – Toro 50 TimeCutter Zero-Turn Mower (SN: 270000001 – 270999999) (2007). 74391 (Z 5000) – Toro 50 TimeCutter Zero-Turn Mower (SN: 280000001 – 280999999) (2008). 74391 (Z 5000) – Toro 50 TimeCutter Zero-Turn Mower (SN: 290000001 – 290000225) (2009). 74399 (Z 5020) – Toro 50 TimeCutter Zero-Turn Mower (SN: 270000001 – 270999999) (2007). 74399 (Z 5020) – Toro 50 TimeCutter Zero-Turn Mower (SN: 280000001 – 280999999) (2008). 74399 (Z 5020) – Toro 50 TimeCutter Zero-Turn Mower (SN: 290000001 – 290000439) (2009). 74399 (Z 5020) – Toro 50 TimeCutter Zero-Turn Mower (SN: 290000440 – 290999999) (2009). 1 x Caster Wheel Assembly. MANUFACTURED TO MEET OR EXCEED OEM PERFORMANCE.